72V BLDC driver has integrated voltage supply

72V BLDC driver has integrated voltage supply

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By Christoph Hammerschmidt

The three half-bridge gate drivers – three high-side and three low-side drivers are controlled across a high-voltage input pin, a digital RUN pin and six digital I/O lines. The configuration options include either six direct control inputs or three enable and three PWM inputs. In the latter case, the delay time is generated automatically; it can be adjusted through an external resistor.

Integrated is a DC/DC buck converter to supply the drivers and other loads with a gate voltage of 11V / 100mA. Another integrated 3.3V DC/DC converter can supply an external microcontroller with a current of 20mA. For higher loads, the regulator can be connected to an external driver transistor.

The E523.50 features a range of diagnosis and protective options: Two error outputs indicate overcurrent, undervoltage and overtemperature. The device is integrated into a thermally efficient exposed-pad QFN package which makes it possible to run the chip near its maximum permitted temperature.  

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